406 
1063. Halsted, B. D. Parasitic fungi as related to variegated plants. <(Bull. Torrey 
Bot. Club, vol. xix, New York, Mar. 5, 1892, pp. 84-88. 
Notes the fact that plants with variegated leaves seem more subject to the attacks of fungi 
than those not variegated. Gives a list of the genera of plants containing species with 
variegated leaves and the genera attacking each. Notes that the more widely the light spots 
are scattered over the leaf, the more generally the leaf is diseased. Considers it natural for 
variegated plants to blight, inasmuch as they are deprived of a large part of the necessary 
chlorophyll and are in a weakened condition in consequence (see notice in Science, vol. 
xix, Mar. 25, 1892, p. 172, Jcol; also Gard. and Forest, vol. v, Mar. 23, 1892, p. 142, where 
the paper is reviewed and an argument advanced against the use of variegated plants as 
ornamental features in landscape gardening). (J. F. J.) 
1064. Halsted, B. D. The influence upon crops of neighboring wild plants. <(Proc. N. 
J. State Hurt. Soo., 17th meeting, Newark, 1892, pp. 110-122 (reprint 13 
pp.). 
Shows the interrelations between wild and cultivated plants, especially as regards the 
effects of fungi upon such crops as lettuce, celery, spinach, etc. Insists upon tlie necessity 
of keeping the plants healthy by proper cultivation, seeding, etc. If this be done, and then 
a fungicide used, its effect'will be most marked (see Bot. Gaz. Apr., 1892, vol. xvn, pp. 
113-118, under the title “'Some fungi common to wild and cultivated plants,” with a few 
changes in phraseology. An extract also given in Science, vol. xix, Apr.29, 1892, p. 243, £ 
col)." (J. F. J.) 
(8ec also No. 1223.) 
II.-DISEASES OF FIELD AND GARDEN CROPS. 
1065. [Anon.] Lettuce mildew. <Gar<l. Cliron., 3<l ser., vol. xr, Loudon, Apr. 23, 
1892, p. 534-535, £ col. 
Notes occurrence of Uremia lactucce m market gardens near London and quotes from W. 
G. Smith remedy lor same (J. F. J.) 
1006 . [Anon.] Potato disease. <(Agr. Gaz. N. S. Wales, vol. in, Sydney, Jan., 
1892, p. 77. 
Gives a statement of the general method of cultivating the potato and says that tho dis¬ 
ease caused by Phytophthora infestans is not known in New South AVales, (J. F. J.) 
1067. Arthur, J. C., and Golden, K. E. Diseases of the sugar-beet root. <[Purdue 
Univ. (Indiana) Agr. Exp. Sta. Bull. No. 39, vol. in, La Fayette, Apr. 13, 
1892, pp. 55-62. 
Describe a disease due to a bacterial parasite which affects in a marked degree the per¬ 
centage of sugar derived from the beets. Beet scab, caused by Oospora scabies Thax., also 
described and illustrated. This disease originates from the soil and is caused by the 
spores lying there, derived from some previous root crop. AVatercore spots, the origin of 
which is unknown, also described (see Gard. Cliron., London, June 4, 1892, p. 726; Exp. 
Sta. Rec., vol. in, July 1892, pp. 853-855; Agr. Sei., vol. VI., Aug. 1892, pp. 383-384; Gard. 
and Forest, vol. v, Apr. 27, 1892, p. 204). (J. F. J.) 
1068. Bailea', L. H. Some troubles of winter tomatoes. <^Cornell Univ. Agr. Exp. 
Sta. Bull. No. 43, Ithaca, N. Y., Sept., 1892, pp. 149-158, figs. 4. 
Describes “winter blight” of tomatoes, a disease affecting plants in the forcing houses. 
This attacks the leaves and sometimes kills the plants outright. Probably caused by bac¬ 
teria, but is different from the bacterial disease of potatoes. No remedy yet known,but it is 
recommended to remove all diseased plants as soon as observed. If disease becomes very 
severe both plants and soil should be removed and a new start made. Common blight, 
caused by Cladosporium fulvum, also described. Spraying with aminoniacal carbonate of 
copper is recommended. Roots of plants are also attacked by nematode root galls. 
(J. F. J.) 
1009 . Behrens, I. Ueber das Auftreten des Hanfkrebses im Elsass. <Zeitsck. 
Pflanzenkrank., vol. I, Stuttgart, 1891, pp. 208-215. 
Two fungi have been observed injuring hemp in Elsass, namely, a Sclerotinia, the species 
of which could not be ascertained, but seemed to be either fuckeliana or libertiana, and Mela- 
nospora cannabis sp. nov. The author examined two crops from 1890 and 1891, and several 
stems from the first year's collection showed the presence of Botrytis. No Botrytis, how¬ 
ever, was observed on material of the following year’s crop, although the stems showed 
numerous by pine of a fungus like those from the preceding year. By transferring this fungus 
upon bread, sclerotia developed very abundantly, but no Botrylis. The fungus proved to 
be a Sclerotinia , of which the species libertiana is well distinguished from fuckeliana by not 
having the Botrytis fructification during the mycelial stage. Further studies are neces¬ 
sary for the specific identification of tli.s fungus. Melanospora cannabis is red and occurs 
upon the base of the stems of hemp. It not only flourishes upon the hemp, but also upon 
the resting stage of Sclerotinia, which it destroys entirely. (T. H.) 
